8x^2-29x-1890=0

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Solution for 8x^2-29x-1890=0 equation:


Simplifying
8x2 + -29x + -1890 = 0

Reorder the terms:
-1890 + -29x + 8x2 = 0

Solving
-1890 + -29x + 8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-236.25 + -3.625x + x2 = 0

Move the constant term to the right:

Add '236.25' to each side of the equation.
-236.25 + -3.625x + 236.25 + x2 = 0 + 236.25

Reorder the terms:
-236.25 + 236.25 + -3.625x + x2 = 0 + 236.25

Combine like terms: -236.25 + 236.25 = 0.00
0.00 + -3.625x + x2 = 0 + 236.25
-3.625x + x2 = 0 + 236.25

Combine like terms: 0 + 236.25 = 236.25
-3.625x + x2 = 236.25

The x term is -3.625x.  Take half its coefficient (-1.8125).
Square it (3.28515625) and add it to both sides.

Add '3.28515625' to each side of the equation.
-3.625x + 3.28515625 + x2 = 236.25 + 3.28515625

Reorder the terms:
3.28515625 + -3.625x + x2 = 236.25 + 3.28515625

Combine like terms: 236.25 + 3.28515625 = 239.53515625
3.28515625 + -3.625x + x2 = 239.53515625

Factor a perfect square on the left side:
(x + -1.8125)(x + -1.8125) = 239.53515625

Calculate the square root of the right side: 15.476923346

Break this problem into two subproblems by setting 
(x + -1.8125) equal to 15.476923346 and -15.476923346.

Subproblem 1

x + -1.8125 = 15.476923346 Simplifying x + -1.8125 = 15.476923346 Reorder the terms: -1.8125 + x = 15.476923346 Solving -1.8125 + x = 15.476923346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8125' to each side of the equation. -1.8125 + 1.8125 + x = 15.476923346 + 1.8125 Combine like terms: -1.8125 + 1.8125 = 0.0000 0.0000 + x = 15.476923346 + 1.8125 x = 15.476923346 + 1.8125 Combine like terms: 15.476923346 + 1.8125 = 17.289423346 x = 17.289423346 Simplifying x = 17.289423346

Subproblem 2

x + -1.8125 = -15.476923346 Simplifying x + -1.8125 = -15.476923346 Reorder the terms: -1.8125 + x = -15.476923346 Solving -1.8125 + x = -15.476923346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8125' to each side of the equation. -1.8125 + 1.8125 + x = -15.476923346 + 1.8125 Combine like terms: -1.8125 + 1.8125 = 0.0000 0.0000 + x = -15.476923346 + 1.8125 x = -15.476923346 + 1.8125 Combine like terms: -15.476923346 + 1.8125 = -13.664423346 x = -13.664423346 Simplifying x = -13.664423346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.289423346, -13.664423346}

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